Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: O que mostra para 1980-81 quando 1973-74 e 2001-02 não participaram?
 ###Tabelas: CREATE TABLE competition_timeline (competition_timeline_id AUTO_INCREMENT PRIMARY KEY, Competition VARCHAR, 1970–71 VARCHAR, 1971–72 VARCHAR, 1972–73 VARCHAR, 1973–74 VARCHAR, 1974–75 VARCHAR, 1975–76 VARCHAR, 1976–77 VARCHAR, 1977–78 VARCHAR, 1978–79 VARCHAR, 1979–80 VARCHAR, 1980–81 VARCHAR, 1981–82 VARCHAR, 1982–83 VARCHAR, 1983–84 VARCHAR, 1984–85 VARCHAR, 1985–86 VARCHAR, 1986–87 VARCHAR, 1987–88 VARCHAR, 1988–89 VARCHAR, 1989–90 VARCHAR, 1990–91 VARCHAR, 1991–92 VARCHAR, 1992–93 VARCHAR, 1993–94 VARCHAR, 1994–95 VARCHAR, 1995–96 VARCHAR, 1996–97 VARCHAR, 1997–98 VARCHAR, 1998–99 VARCHAR, 1999–00 VARCHAR, 2000–01 VARCHAR, 2001–02 VARCHAR, 2002–03 VARCHAR, 2003–04 VARCHAR, 2004–05 VARCHAR, 2005–06 VARCHAR, 2006–07 VARCHAR, 2007–08 VARCHAR, 2008–09 VARCHAR, 2009–10 VARCHAR, 2010–11 VARCHAR, 2011–12 VARCHAR) CREATE TABLE fox_nbc_era_2001-2006 (fox_nbc_era_2001-2006_id AUTO_INCREMENT PRIMARY KEY, Year INT, Network VARCHAR, Lap-by-lap VARCHAR, s Color commentator VARCHAR, Pre-Race Host VARCHAR, Ratings VARCHAR) CREATE TABLE variation_with_playing_cards (variation_with_playing_cards_id AUTO_INCREMENT PRIMARY KEY, 1st player's choice VARCHAR, 2nd player's choice VARCHAR, Probability 1st player wins VARCHAR, Probability 2nd player wins VARCHAR, Probability of a draw VARCHAR) CREATE TABLE doubles_7_4-3 (doubles_7_4-3_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date VARCHAR, Tournament VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents VARCHAR, Score VARCHAR) CREATE TABLE 2501–2600 (2501–2600_id AUTO_INCREMENT PRIMARY KEY, NGC number INT, Object type VARCHAR, Constellation VARCHAR, Right ascension ( J2000 ) VARCHAR, Declination ( J2000 ) VARCHAR, Apparent magnitude INT)  
SELECT 1980–81 FROM competition_timeline WHERE 1973–74 = did not participate AND 2001–02 = did not participate